fix the common window border radius issue and give the firefox css code a better sense

src/main/gtk-3.0/gtk-dark-blue.css

@@ -1769,6 +1769,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-dark-green.css

@@ -1769,6 +1769,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-dark-grey.css

@@ -1769,6 +1769,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-dark-orange.css

@@ -1769,6 +1769,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-dark-pink.css

@@ -1769,6 +1769,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-dark-purple.css

@@ -1769,6 +1769,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-dark-red.css

@@ -1769,6 +1769,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-dark-solid-blue.css

@@ -1769,6 +1769,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-dark-solid-green.css

@@ -1769,6 +1769,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-dark-solid-grey.css

@@ -1769,6 +1769,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-dark-solid-orange.css

@@ -1769,6 +1769,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-dark-solid-pink.css

@@ -1769,6 +1769,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-dark-solid-purple.css

@@ -1769,6 +1769,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-dark-solid-red.css

@@ -1769,6 +1769,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-dark-solid-yellow.css

@@ -1769,6 +1769,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-dark-solid.css

@@ -1769,6 +1769,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-dark-yellow.css

@@ -1769,6 +1769,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-dark.css

@@ -1769,6 +1769,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-light-blue.css

@@ -1777,6 +1777,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-light-green.css

@@ -1777,6 +1777,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-light-grey.css

@@ -1777,6 +1777,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-light-orange.css

@@ -1777,6 +1777,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-light-pink.css

@@ -1777,6 +1777,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-light-purple.css

@@ -1777,6 +1777,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-light-red.css

@@ -1777,6 +1777,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-light-solid-blue.css

@@ -1777,6 +1777,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-light-solid-green.css

@@ -1777,6 +1777,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-light-solid-grey.css

@@ -1777,6 +1777,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-light-solid-orange.css

@@ -1777,6 +1777,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-light-solid-pink.css

@@ -1777,6 +1777,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-light-solid-purple.css

@@ -1777,6 +1777,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-light-solid-red.css

@@ -1777,6 +1777,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-light-solid-yellow.css

@@ -1777,6 +1777,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-light-solid.css

@@ -1777,6 +1777,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-light-yellow.css

@@ -1777,6 +1777,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/main/gtk-3.0/gtk-light.css

@@ -1777,6 +1777,10 @@ window > .titlebar:not(headerbar), window > .titlebar:not(headerbar):backdrop, w
   min-width: 1px;
 }
 
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar button, .titlebar button {
   min-height: 26px;
   min-width: 22px;

src/other/firefox/chrome/WhiteSur/rounded-window-maximized.css

@@ -1,5 +1,5 @@
 @namespace xul url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
 
-:root[tabsintitlebar]:not([inFullscreen]) #nav-bar {
+:root[tabsintitlebar]:not([inFullscreen])[sizemode="maximized"] #nav-bar {
 	border-radius: 16px 16px 0 0;
 }

src/sass/gtk/_common.scss

@@ -1647,6 +1647,11 @@ window.background > box.vertical > headerbar:not(.titlebar) { // reset headerbar
   }
 }
 
+// Fixes common window border radius problem when it get maximized
+window.background.csd.maximized {
+  border-radius: 0px;
+}
+
 headerbar, .titlebar {
   button {
     min-height: 26px;